I use a Boss LMB-3. It can do anything from gentle compression up to hard limiting, and I find the threshold to be a very useful range. The Behringer is a fairly good clone of the LMB, it seems to sound pretty much the same, but with a plastic body. If you can pick up a s/h LMB for about £30 or £40 it will be worthwhile, and will last forever. And if you decide you don't like it you will get your money back by selling it on here.
Also, with the compression ratio set to 1:1 (no compression at all), it can be used as a booster.
Cheers
Geoff